Question

Identitas trigonometri
No.1
1 - tan alpa/sec alpa=cos alpa - sin alpa
No.2
Tan alpa/1 - tan alpa=sin alpa×cos alpa/cos alpa×sin alpa
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Answer 1

No 1
1-tan a/sec a = cos a - sin a
(1-tan a).cos a = cos a - sin a
1-tan a = cos a/cos a - sin a/cos a
1-tan a = 1 - tan a